EVK1070B Demonstration Kit User Guide
Contents
1. AMEL EVK1070B Demonstration Kit Design Guide 10641A AT42 11 10 AMEL Headquarters Atmel Corporation 2325 Orchard Parkway San Jose CA 95131 USA Tel 1 408 441 0311 Fax 1 408 487 2600 International Atmel Asia Unit 01 05 amp 16 19F BEA Tower Millennium City 5 418 Kwun Tong Road Kwun Tong Kowloon HONG KONG Atmel Munich GmbH Business Campus Parkring 4 D 85748 Garching b MUNICH Tel 49 89 31970 111 Fax 49 89 3194621 Atmel Japan 9F Tonetsu Shinkawa Bldg 1 24 8 Shinkawa Chuo ku Tokyo 104 0033 JAPAN Tel 81 3 3523 3551 Fax 81 3 3523 7581 Tel 852 2245 6100 Fax 852 2722 1369 Touch Technology Division 1560 Parkway Solent Business Park Whiteley Fareham Hampshire PO15 7AG UNITED KINGDOM Tel 44 844 894 1920 Fax 44 1489 557 066 Product Contact Web Site Technical Support www atmel com touch atmel com Sales Contact www atmel com contacts Literature Requests www atmel com literature Disclaimer The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN ATMEL S TERMS AND CONDITIONS OF SALE LOCATED ON ATMEL S WEB SITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY W2. check box Part number AT42QT1070 F l e Show key numbers FZ Show key numbers check box Reset Calibrate Exit 2 3 Showing the Key Numbers To show the key numbers see Figure 2 2 select the Show key number check box The key numbers correspond to the key numbers on the EVK1070B evaluation board 2 4 Showing Debug Data and Graph To show the debug data select the Show debug data check box The EVK1070B Debug window see Figure 2 3 on page 2 3 opens showing the signal and reference data for all the keys To stop the window updating click Pause To restart the data update click Play 2 2 AIMEL EVK1070B Demonstration Kit User Guide 10641A AT42 11 10 Configuring and Using the EVK1070B Figure 2 3 EVK1070B Debug Window M 4_SP_Documentation Manuals EVK1 O70 EVK1070B_101108_1102 csv At the same time the EVK1070B Demonstration Software window shows the signal and reference values for each key see Figure 2 4 Figure 2 4 EVK1070B Demonstration Software Window Showing Signal and Reference Data BAEvK1070B Demonstration Software O x AIMEL Chip ID Ox2E Code Ver 1 5 General Status 0x00 Show AKS group D Key Status 0x00 Show debug data M Part number AT42QT1070 Show graph r Show settings Iv Vv Reset Calibrate Exit Bridge Chip 5030 To see a graph of the signal reference and threshold levels for individual keys select the Show graph check box
3. the key remains in detect for the DI period until it has filtered out of detect If the Fast out check box is selected then the DI for filtering out of detect is fixed to a setting of 4 Hence filtering out is much quicker if a high DI is required for filtering in If the Fast out check box is clear the same DI is used for filtering in and out of detect AIMEL EVK1070B Demonstration Kit User Guide ay 2 7 10641A AT42 11 10 Configuring and Using the EVK1070B 2 7 2 7 1 2 7 2 2 7 3 2 7 4 2 7 5 2 7 6 2 7 7 2 8 Functions Overview The functions relate to the buttons on the EVK1070B Settings dialog box Calibrate Click Calibrate to calibrate the EVK1070B Reset Click Reset to reset the EVK1070B It loads the default settings Restore Defaults Click Restore Defaults to restore the default settings to the chip Cancel Changes Click Cancel Changes to cancel any changes made before clicking Write All Settings After this you will not be able to cancel the settings Write All Settings Click Write All Settings to write the current settings to the chip You need to do this before the changes are implemented Close Click Close to exit the EVK1070B Settings dialog box AMEL EVK1070B Demonstration Kit User Guide 10641A AT42 11 10 Revision History Revision No History e Initial version of the user manual for firmware code revision 1 5 of the Revision A November 2010 AT42QT1070
4. 1 2 2 Open the software by navigating to the directory in which you stored it and double click the exe file The EVK1070B Demonstration Software window opens and general information about the EVK1070B is shown see Figure 2 1 Figure 2 1 EVK1070B Demonstration Software Window BAEVK10708 Demonstration Software JOU x AIMEL Chip ID Ox2E CodeVer 1 5 s ue Shows information General Status 0x00 Show AKS group FT when the board is Key Status 0x00 Show debug data T connectedito the Partnumber AT42QT1070 how grap m computer and the software is open Show settings check box Show settings Show key numbers Exit 2 2 Viewing AKS Groups To see which keys are in which Adjacent Key Suppression AKS group select the Show AKS Group check box There can be up to three AKS groups Different groups have different colors around the edge of the keys associated with them see Figure 2 2 on page 2 2 To change an AKS setting see Section 2 6 5 on page 2 6 EVK1070B Demonstration Kit User Guide 2 1 10641A AT42 11 10 Configuring and Using the EVK1070B Figure 2 2 AKS Groups and Key Numbers DEYK 10708 Demonstration Software EEE he different colors ChipID Ox2E around the keys Code Ver 1 5 denote which AKS MN ee group a key is in a o Eee EE Key numbers Show AKS group General Status 0x00 Show AKS group MW Key Status 0x00 Show debug data
5. 2 on page 2 6 than the other keys If a guard channel is enabled and active any other channel in the same AKS group will be forced out of its filtering in stage if the guard channel begins to go into detect Only one guard channel can be selected Note The guard channel will not force a key which is already in a detect state out of detection Valid values are 0 6 corresponding to key numbers with any larger value disabling the guard key feature Default Key 0 2 6 8 Max On Duration If an object obstructs the sense pad the signal may rise enough to create a detection preventing further operation To prevent this the sensor includes a timer which monitors detections If a detection exceeds the timer setting then the sensor performs a key recalibration This is known as the Max On Duration This can be changed by setting a value in the range 1 255 160 ms 40800 ms in steps of 160 ms A setting of O disables the Max On Duration recalibration This is a global setting Default 180 160 ms x 180 28 8s 2 6 9 Individual Recalibration This is user configurable If a key is in detect for the Max On Duration time then only that key recalibrates if this setting is enabled Otherwise all keys are recalibrated 2 6 10 Fast Out The DI is used for filtering a key into and out of detect The higher the DI setting then the longer the touch must be present for that key to go into detect The same applies for removing a touch
6. ARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS OF PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel s products are not intended authorized or warranted for use as components in applications intended to support or sustain life 2010 Atmel Corporation All rights reserved Atmel Atmel logo and combinations thereof Adjacent Key Suppression AKS and others are registered trademarks of Atmel Corporation or its subsidiaries Other terms and product names may be registered trademarks or trademarks of others 10641A AT42 11 10
7. EVK1070B Demonstration Kit User Guide AMEL 10641A AT42 11 10 AIMEL ii ey O EVK1070B Demonstration Kit User Guide 10641A AT42 11 10 AIMEL T Section 1 Overview 1 1 Introduction The EVK1070B Demonstration Kit is designed for the evaluation and development of applications using the AT42QT1070 QT1070 sensor controller See Section 1 2 for the contents of the kit Each EVK1070B evaluation board has a serial USB interface allowing connection to a computer for control and data viewing via QT1070 demonstration computer software The board operates in comms mode and can have 1 7 keys one of which can be used as a guard key Refer to the AT42QT1070 datasheet for detailed information about the chip features 1 2 Contents of Kit The kit comprises m 1x EVK1070B Evaluation Board see Figure 1 1 m 1 x USB Cable m 1 x EVK1070B Quickstart Guide It is recommended that new users work through the Quickstart Guide to familiarise themselves with the kit and software before reading this User Guide Figure 1 1 EVK1070B Evaluation Board 1a _ AAA T Ens o EVK1070B Demonstration Kit User Guide 1 1 10641A AT42 11 10 Overview 1 3 Preparing the Kit for Use To prepare the EVK1070B Demonstration Kit for use with the software 1 Download the latest EVK1070B software from the Atmel website www atmel com touch AT42QT1070 and store on your computer 2 Using the USB cable connect the EVK1070B evaluation b
8. The Key Graph window opens see Figure 2 5 on page 2 4 showing the signal and reference data for all of the keys individually AMEL o EVK1070B Demonstration Kit User Guide Ty 10641 A AT42 11 10 Configuring and Using the EVK1070B Figure 2 5 Key Graph Window Key x Ref831 STE 32 ss 2 5 Logging Data The data logging procedures are as follows m Set the location where you want to keep the csv log file Click at the end of the file name box Navigate to the directory where you want to store the csv file A Save As dialog box opens Enter the file name and click Save m To log the data from the EVK1070B Debug window click Log The data starts being recorded into a log file csv m To stop recording the data click Stop m To view the data navigate to the directory where the csv file is stored and open the file The file opens in Excel and shows all captured data 10641A AT42 11 10 EVK1070B Demonstration Kit User Guide Configuring and Using the EVK1070B 2 6 Changing the Settings 2 6 1 Overview The settings are changed from the EVK1070B Settings dialog box see Figure 2 6 From the EVK1070B Demonstration Software window see Figure 2 1 on page 2 1 select the Show settings check box This action opens the EVK1070B Settings dialog box which shows the various options whose settings can be changed These are Threshold Level Threshold Averaging Factor Averaging Factor Detect Integra
9. hreshold level range of values is between 0 255 They can be set individually for each key You should select a minimum of 8 10 counts Typical values are 15 25 Note Do not use a setting of O as this causes a key to go into detection when its signal is equal to its reference Default 20 2 6 3 Averaging Factor The Averaging Factor AVE is the number of pulses which are added together and averaged to get the final signal value for that channel For example if AVE 8 then 8 ADC samples are taken and added together The result is then divided by the original number of pulses 8 This gives the average value Using the AVE provides a better signal to noise ratio but requires longer acquire times Values for AVE are restricted internally to 1 2 4 8 16 or 32 The Averaging Factor can be set individually for each key A typical value of 8 is recommended for good low frequency noise immunity Default 8 2 6 4 Detect Integrator The device features a fast detection integrator counter DI filter which acts to filter out noise at the small expense of a slower response time The DI filter requires a programmable number of consecutive samples confirmed in detection before the key is declared to be touched The minimum number for the DI filter is 2 Settings of O and 1 for the DI also default to 2 The detection integrator values are between 0 255 and can be set individually for each key A typical value is 4 A higher DI g
10. ives higher noise immunity but at the cost of increasing the response time A large difference between keys gives different response times Default 4 2 6 5 AKS Group AKS is used to suppress the activation of two neighboring keys at the same time only the key with the strongest signal level can activate This solves the problem that occurs when a finger placed on a key also overlaps a neighboring key potentially triggering it as well as the intended key There are three AKS groups 1 2 and 3 There is also an Off function whereby AKS is not used on that channel Any key can be in any AKS group or none Default 1 2 6 6 Low Power Mode 2 6 10641A AT42 11 10 This 8 bit value determines the number of 8 ms intervals between key measurements Longer intervals between measurements yield a lower power consumption but at the expense of a slower response to touch The times are between 8 ms 2 040 ms This is a global setting Default 2 16 ms between key acquisitions AMEL EVK1070B Demonstration Kit User Guide Configuring and Using the EVK1070B 2 6 7 Guard Channel A Guard Channel is used to help prevent false detection of keys Normally guard channel keys should be more sensitive than the other keys physically bigger Because the guard channel key is physically bigger it becomes more susceptible to noise so it should have a higher Averaging Factor see Section 2 6 3 on page 2 6 and a lower Threshold see Section 2 6
11. oard to the computer The LED on the EVK1070B lights and remains lit indicating that there is power to the board see Figure 1 2 Figure 1 2 EVK1070B Evaluation Board With Power ae USB cable LED lights when LE AT42QT1070 there is power to 3 2 FT the board g g BHBBEH 4 2 ere eS 2010 Atmel Corp www atmel com 1 4 Restoring Default Settings If the device configuration is changed and you want to restore the original settings there is a Reset Defaults function see Section 2 7 4 on page 2 8 1 5 Calibration The Calibrate function can be accessed from two places m From the EVK1070B Demonstration Software window see Figure 2 1 on page 2 1 m From the EVK1070B dialog box see Figure 2 6 on page 2 5 See Section 2 7 2 on page 2 8 for details 10641A AT42 11 10 EVK1070B Demonstration Kit User Guide Overview 1 6 Reset The Reset function can be accessed from two places m From the EVK1070B Demonstration Software window see Figure 2 1 on page 2 1 m From the EVK1070B dialog box see Figure 2 6 on page 2 5 See Section 2 7 3 on page 2 8 for details EVK1070B Demonstration Kit User Guide AIMEL 1 3 10641A AT42 11 10 Overview AMEL 1 4 10641A AT42 11 10 EVK1070B Demonstration Kit User Guide AIMEL T Section 2 Configuring and Using the EVK1070B 2 1 Configuring the EVK1070B To configure the EVK1070B for use proceed as follows 1 Prepare the kit for use see Section 1 3 on page
12. tor Detect Integrator AKS Group AKS Grp Low Power Mode LPM Guard Channel Guard Max On Duration Max On Some values are changed by dragging a bar or clicking in the oblong box Other values are selected from menus You can cancel changes by clicking Cancel Changes see Section 2 7 5 on page 2 8 Note This cancels all the changes not just the last one you made To make all the changes active click Write All Settings see Section 2 7 6 on page 2 8 to put the values into RAM Figure 2 6 EVK1070B Settings Dialog Box Key Settings Ary made below will be highbghted in BLUE until they are witten with the Write AN Settings button or ae ay using Cancel Changes button Changes to form settings will remain persistent during Calibration or Reset operat Key Threshold Averaging Factor Detect Integrator AKS Grp LPM om 2 8 1 4 1 j Piim 1 a 1 a Guard 2m 2 fe gt a fo 3m 20 8 z sa Max On sm 20 f z 180 5 20 l 4 x 6 2 I a Cabiate Click in the box or drag the blue Click the downward arrow and bar to the required position select a value from the options AIMEL EVK1070B Demonstration Kit User Guide 2 5 a 1064 A AT 42 11 10 Configuring and Using the EVK1070B 2 6 2 Threshold Level The device detects a touch when the signal has crossed a threshold level and remained there for a specified number of counts This can be altered on a key by key basis The t
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